Lid construction



United States Patent Koch et al Primary Examiner-Joseph R. Leclair Assistant Examiner-Steven E. Lipman Attorney-Albert .1. Kramer ABSTRACT: A cardboard lid is made by joining the flange of a disc to an overlapping and beaded marginal portion of a cardboard cylindrical member with glue between the outer edge of the flange and the inner wall of the marginal portion. The glue, typically, may be applied by placing a nozzle on the inside of the cylinder and rotating the cylinder relative to the [72] Inventor John B. West Pikesville, Maryland [21] Appl. No. 832,523 [22] Filed March 25,1969

Division of Ser. No. 655,096, July 21, 1967, now Pat. No. 3,469,507. [45] Patented Dec. 1,1970 [73] Assignee Maryland Cup Corporation Owings Mills, Maryland a corporation of Maryland 541 LID CONSTRUCTION 4 Claims, 8 Drawing Figs.

[52) U.S.Cl. 229/43,

' 220/67, 229/5.6 [51] lnt.Cl. 865d 5/64, 865d 3/14 [50] Field olSeareh 229/5.5,

[5 6] References Cited UNITED STATES PATENTS 902,754 11/1908 Maxwell 229/5.6 995,953 6/1911 Comings 229/5.6X

nozzle as the glue is discharged therethrough. This places the. glue between surfaces which are conventionally not printed or treated in a way to adversely affect the adhesion of the glue and permits the use of less cardboard material.

Patented Dec. 1,1970 3,543,996

I8 is l4 v Z u P U H -|3 I2 {5 FIG. 6. u

W; ATTORNEY 5 INVENTOR. I JOHN 8. WEST I filed July 21, 1967, which is now US. Pat. No. 3,469,507.

This invention relates to lids and it is more particularly concerned with skirt-type lids and of cardboard used to close the ends of cylindrical containers and to a method of manufacturingthem. H

An object of the invention is the provision of a novel cardboard lid of the general type mentioned and to a new methocl of assembling the parts thereof.

Prior methods of manufacturing such lids comprised placing a flanged cardboard disc within a cardboard cylinder adjacent one end of the cylinder and then rolling the end of the cylinder together with the flange of the disc to form a joint between them. This produced a lid of considerable weakness that permitted loosening of thedisc and cylinder easily relative to each other. Under certain conditions, the rolled end had a tendency to partially unroll under relatively weak forces. In cases, for example, of a frozen confection in the container, the disc part sometimes adhered by freezing to the confection, whereupon lifting of the cylindrical part of the lid would disengage these two parts from each other.

Hence, a specific object of the invention is the provision of a lid which can successfully resist such tendencies.

A further specific object of the invention is the provision of such a lid in which the disc is glued to the cylindrical member along surfaces of both the cylinder and the discwhich do not ordinarily affect the adhesion of the flue adversely, such as might occur by an overprinting on the outside of the lid and other surface treatments.

A still further object is the provision of a lid of the type mentioned which requires less material for its manufacture.

These and still further objects, advantages and features of the invention will appear more fully. from the following description considered together with the accompanying drawing which illustrates an embodiment of the invention.

in the drawing:

FIG. 1 is a cross-sectional view of a flanged cardboard disc member comprising one of the. elements of the embodiment.

FIG. 2 is a cross-sectional-view of a paper cylinder comprising a second element of the embodiment.

FIG. 3 is a cross-sectional view illustrating a preliminary position of the flanged disc within the cylinder as a step in the method of manufacturing the lid.

FIGS. 4, 5 and 6 are diagrammatic sectional views of the cylinder and lid in subsequent steps in the method of manufacturing the lid. I

FIG. 7 is an enlarged g fragmentary view of a portion of F IG. 6.

F lG. 8'is a perspective view of the partsin the relative positions of FIG. 4. I

Referring with more particularity to the drawing in which like numerals designate like parts, the embodiment is illustrated in relation to a conventional cardboard cylinder ll and a conventional flanged cardboard disc 12.

in flanged disc 12 is disposed within the cylinder 1!, the annular flange 13 thereof being bent at an obtuse angle so that its outer edge presses outwardly against the inner wall 14 of the cylinder.

The next step of the method comprises placing glue, preferably in the form of a ring 15, on the inner wall 14 in spaced relation to the outer edge 16 of the flange 13. The ring [5 may either be subdivided on as a broken line or continuous, as shown. This may conveniently be done by rotating the cylindrical member relative to a stationary glue nozzle 17. See

form a beaded interlock l 9.

As a result, the glue ring lS disposed between the outer end 16 of the flange'and a portion of the inner wall of the cylinder. A firs firm seal is effected between these parts, because the outer edge 16 is a raw edge of paper that tenaciously adheres to glue and the inner wall of the cylinder is ordinarily not printed for reasons of sanitation and not coated with anything that would be incompatible with the glue or which would advers'ely affect its adhesive properties. Also, less cardboard material is required, inasmuch as less material is needed for the bead l9 and flange l3-than is needed in conventionally made lids that require a beading of the combined marginal end of the cylinder and flange.

lclaim:

l. A lid for cylindrical cartons comprising a cardboard cylindrical member, a cardboard disc member within the cylindrical member, said disc member having a curled outer portion adjacent a marginal portion of the cylindrical member, said curled portion having a raw edge, said marginal portion having a flange rolled inwardly in overlapping and interlocking relation to the said curled outer portion of the disc member, said flange having an inner uncoated wall and a glue joint between and in direct contact with the said raw edge and the said uncoated wall.

2. A lid as defined by claim 1 in which the raw edge of the flange and the inner wall of the cylinder are substantially free of any treatment to adversely affect the adhesion thereto of the glue.

3. A lid as defined by claim 1 in which the glue joint is continuous andendless.

4. A lid as defined by claim 1 in which the glue joint is subdivided. 

